GOODWILL AND INTANGIBLE ASSETS - Activity of Goodwill by Reportable Operating Segment (Detail) $ in Thousands	9 Months Ended
	Jul. 01, 2016 USD ($)
Goodwill [Roll Forward]
Balance, beginning	$ 283,452	[1]
Foreign currency translation adjustments	(600)
Balance, ending	282,894
Oncology Systems
Goodwill [Roll Forward]
Balance, beginning	158,800
Foreign currency translation adjustments	0
Balance, ending	158,800
Imaging Components
Goodwill [Roll Forward]
Balance, beginning	74,700
Foreign currency translation adjustments	0
Balance, ending	74,700
Other
Goodwill [Roll Forward]
Balance, beginning	50,000
Foreign currency translation adjustments	(600)
Balance, ending	$ 49,400

[1] The condensed consolidated balance sheet as of October 2, 2015 was derived from audited financial statements as of that date, but does not include all disclosures required by accounting principles generally accepted in the United States of America.